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+/*
+ * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Provides the classes for implementing networking applications.
+ *
+ * <p> The java.net package can be roughly divided in two sections:</p>
+ * <ul>
+ * <li><p><i>A Low Level API</i>, which deals with the
+ * following abstractions:</p>
+ * <ul>
+ * <li><p><i>Addresses</i>, which are networking identifiers,
+ * like IP addresses.</p></li>
+ * <li><p><i>Sockets</i>, which are basic bidirectional data communication
+ * mechanisms.</p></li>
+ * <li><p><i>Interfaces</i>, which describe network interfaces. </p></li>
+ * </ul></li>
+ * <li> <p><i>A High Level API</i>, which deals with the following
+ * abstractions:</p>
+ * <ul>
+ * <li><p><i>URIs</i>, which represent
+ * Universal Resource Identifiers.</p></li>
+ * <li><p><i>URLs</i>, which represent
+ * Universal Resource Locators.</p></li>
+ * <li><p><i>Connections</i>, which represents connections to the resource
+ * pointed to by <i>URLs</i>.</p></li>
+ * </ul></li>
+ * </ul>
+ * <h2>Addresses</h2>
+ * <p>Addresses are used throughout the java.net APIs as either host
+ * identifiers, or socket endpoint identifiers.</p>
+ * <p>The {@link java.net.InetAddress} class is the abstraction representing an
+ * IP (Internet Protocol) address. It has two subclasses:
+ * <ul>
+ * <li>{@link java.net.Inet4Address} for IPv4 addresses.</li>
+ * <li>{@link java.net.Inet6Address} for IPv6 addresses.</li>
+ * </ul>
+ * <p>But, in most cases, there is no need to deal directly with the subclasses,
+ * as the InetAddress abstraction should cover most of the needed
+ * functionality.</p>
+ * <h3><b>About IPv6</b></h3>
+ * <p>Not all systems have support for the IPv6 protocol, and while the Java
+ * networking stack will attempt to detect it and use it transparently when
+ * available, it is also possible to disable its use with a system property.
+ * In the case where IPv6 is not available, or explicitly disabled,
+ * Inet6Address are not valid arguments for most networking operations any
+ * more. While methods like {@link java.net.InetAddress#getByName} are
+ * guaranteed not to return an Inet6Address when looking up host names, it
+ * is possible, by passing literals, to create such an object. In which
+ * case, most methods, when called with an Inet6Address will throw an
+ * Exception.</p>
+ * <h2>Sockets</h2>
+ * <p>Sockets are means to establish a communication link between machines over
+ * the network. The java.net package provides 4 kinds of Sockets:</p>
+ * <ul>
+ * <li>{@link java.net.Socket} is a TCP client API, and will typically
+ * be used to {@linkplain java.net.Socket#connect(SocketAddress)
+ * connect} to a remote host.</li>
+ * <li>{@link java.net.ServerSocket} is a TCP server API, and will
+ * typically {@linkplain java.net.ServerSocket#accept accept}
+ * connections from client sockets.</li>
+ * <li>{@link java.net.DatagramSocket} is a UDP endpoint API and is used
+ * to {@linkplain java.net.DatagramSocket#send send} and
+ * {@linkplain java.net.DatagramSocket#receive receive}
+ * {@linkplain java.net.DatagramPacket datagram packets}.</li>
+ * <li>{@link java.net.MulticastSocket} is a subclass of
+ * {@code DatagramSocket} used when dealing with multicast
+ * groups.</li>
+ * </ul>
+ * <p>Sending and receiving with TCP sockets is done through InputStreams and
+ * OutputStreams which can be obtained via the
+ * {@link java.net.Socket#getInputStream} and
+ * {@link java.net.Socket#getOutputStream} methods.</p>
+ * <h2>Interfaces</h2>
+ * <p>The {@link java.net.NetworkInterface} class provides APIs to browse and
+ * query all the networking interfaces (e.g. ethernet connection or PPP
+ * endpoint) of the local machine. It is through that class that you can
+ * check if any of the local interfaces is configured to support IPv6.</p>
+ * <p>Note, all conforming implementations must support at least one
+ * {@code NetworkInterface} object, which must either be connected to a
+ * network, or be a "loopback" interface that can only communicate with
+ * entities on the same machine.</p>
+ *
+ * <h2>High level API</h2>
+ * <p>A number of classes in the java.net package do provide for a much higher
+ * level of abstraction and allow for easy access to resources on the
+ * network. The classes are:
+ * <ul>
+ * <li>{@link java.net.URI} is the class representing a
+ * Universal Resource Identifier, as specified in RFC 2396.
+ * As the name indicates, this is just an Identifier and doesn't
+ * provide directly the means to access the resource.</li>
+ * <li>{@link java.net.URL} is the class representing a
+ * Universal Resource Locator, which is both an older concept for
+ * URIs and a means to access the resources.</li>
+ * <li>{@link java.net.URLConnection} is created from a URL and is the
+ * communication link used to access the resource pointed by the
+ * URL. This abstract class will delegate most of the work to the
+ * underlying protocol handlers like http or https.</li>
+ * <li>{@link java.net.HttpURLConnection} is a subclass of URLConnection
+ * and provides some additional functionalities specific to the
+ * HTTP protocol.</li>
+ * </ul>
+ * <p>The recommended usage is to use {@link java.net.URI} to identify
+ * resources, then convert it into a {@link java.net.URL} when it is time to
+ * access the resource. From that URL, you can either get the
+ * {@link java.net.URLConnection} for fine control, or get directly the
+ * InputStream.<p>
+ * <p>Here is an example:</p>
+ * <p><pre>
+ * URI uri = new URI("http://java.sun.com/");
+ * URL url = uri.toURL();
+ * InputStream in = url.openStream();
+ * </pre>
+ * <h2>Protocol Handlers</h2>
+ * As mentioned, URL and URLConnection rely on protocol handlers which must be
+ * present, otherwise an Exception is thrown. This is the major difference with
+ * URIs which only identify resources, and therefore don't need to have access
+ * to the protocol handler. So, while it is possible to create an URI with any
+ * kind of protocol scheme (e.g. {@code myproto://myhost.mydomain/resource/}),
+ * a similar URL will try to instantiate the handler for the specified protocol;
+ * if it doesn't exist an exception will be thrown.
+ * <p>By default the protocol handlers are loaded dynamically from the default
+ * location. It is, however, possible to add to the search path by setting
+ * the {@code java.protocol.handler.pkgs} system property. For instance if
+ * it is set to {@code myapp.protocols}, then the URL code will try, in the
+ * case of http, first to load {@code myapp.protocols.http.Handler}, then,
+ * if this fails, {@code http.Handler} from the default location.<p>
+ * <p>Note that the Handler class <b>has to</b> be a subclass of the abstract
+ * class {@link java.net.URLStreamHandler}.</p>
+ * <h2>Additional Specification</h2>
+ * <ul>
+ * <li><a href="doc-files/net-properties.html">
+ * Networking System Properties</a></li>
+ * </ul>
+ *
+ * @since JDK1.0
+ */
+package java.net;